Electronic apparatus and transmission system

ABSTRACT

An electronic apparatus includes a switch control section configured to: determine whether a received signal is any one of a power signal and a data signal based on the received signal, and select any one of a power-reception operation and a data-transmission operation based on the determination of the received signal.

TECHNICAL FIELD

The present disclosure relates to a transmission system performingnon-contact power transmission and non-contact data transmission (powerfeeding and communication) with use of a magnetic field, and to anelectronic apparatus (apparatus to be fed with power, power receiver)applied to such a transmission system.

BACKGROUND ART

In recent years, a feed system (a non-contact feed system, a wirelesscharging system) performing non-contact power supply (powertransmission) to CE devices (consumer electronics devices) such asmobile phones and mobile music players has attracted attention.Accordingly, charging is allowed to be started by not inserting(connecting) a connector of a power supply such as an AC adapter into aunit but placing an electronic apparatus (a secondary-side unit) on acharging tray (a primary-side unit). In other words, terminal connectionbetween the electronic apparatus and the charging tray is not necessary.

The methods of performing non-contact power supply in such a way arelargely classified into two kinds of techniques. The first technique isa well-known electromagnetic induction system. In the electromagneticinduction system, a degree of coupling between a power transmission side(a primary side) and a power reception side (a secondary side) isextremely high so that feeding is achievable with high efficiency. Thesecond technique is a so-called magnetic resonance system which hascharacteristics that a magnetic flux shared by the power transmissionside and the power reception side may be reduced by actively usingresonance phenomenon.

In addition, as a communication method (data transmission method) havinga principle similar to the above-described non-contact powertransmission, there is an NFC (near field communication). The NFC is aninternational standard of wireless communication, and is a wirelesscommunication technology consuming less power. Moreover, the NFC is alsoan example of the standard in RFID (radio frequency identification,individual identification by radio) technology used mainly in transportfacilities and the like in Japan (for example, a standard limited at aused frequency of 13.56 MHz).

The transmission system incorporating both the non-contact powertransmission system and the non-contact data transmission system (withuse of a magnetic field) is proposed in, for example, Patent Literatures1 to 3.

CITATION LIST Patent Literature

-   PTL 1: Japanese Patent Application Unexamined Publication No.    2011-172299-   PTL 2: Japanese Patent Application Unexamined Publication No.    2010-284065-   PTL 3: Japanese Patent Application Unexamined Publication No.    2005-202721

SUMMARY OF INVENTION

In the transmission system in any of Patent Literatures 1 to 3, a powerreception coil and a data transmission coil are common as a single coil.Therefore, the number (kinds) of coils is allowed to be reduced, andcost reduction and downsizing are achievable. However, it is desirablethat the difficulty caused by the difference between the two systems(the power transmission system and the data transmission system) besolved and safety be improved.

Accordingly, it is desirable to provide an electronic apparatus and atransmission system which are capable of improving safety whileachieving cost reduction and downsizing at the time of performing powertransmission and data transmission with use of a magnetic field.

An electronic apparatus includes a switch control section configured to:determine whether a received signal is any one of a power signal and adata signal based on the received signal, and select any one of apower-reception operation and a data-transmission operation based on thedetermination of the received signal.

In another embodiment, a method of routing a received wireless signalbased on a frequency is provided. The method includes: receiving asignal wirelessly from a feed unit via magnetic inductance; applying afirst filter to the received signal to generate a first frequencycomponent; applying a second filter to the received signal to generate asecond frequency component; routing the received signal to apower-reception operation section if a magnitude of the first frequencycomponent exceeds a first voltage threshold; and routing the receivedsignal to a data-transmission operation section if a magnitude of thesecond frequency component exceeds a second voltage threshold.

In another embodiment, an electronic system includes: a transmitterconfigured to wirelessly transmit a power signal and a data signal; anelectronic device wirelessly communicatively coupled to the transmitter,the electronic device including: a switch control section to: determinewhether a signal received from the transmitter is the power signal orthe data signal based on a frequency component of the received signal;and select any one of a power-reception operation and adata-transmission operation based on the determination of the receivedsignal. In an embodiment, the electronic device includes an inductioncoil that is electromagnetically coupled to a second induction coilincluded within the transmitter.

In the electronic apparatus and the transmission system according to theembodiments of the disclosure, with use of the common coil, the powertransmitted through the power transmission with use of a magnetic fieldis received, and the mutual data transmission with use of a magneticfield is performed. In other words, since both the power receptionoperation and the data transmission operation are performed with use ofthe single common coil, the number (kinds) of coils is allowed to bereduced, compared with the case where these operations are performedwith use of dedicated coils (a power reception coil and a datatransmission coil). In addition, the switching control of ON/OFF stateof each of the first changeover switch on the path between the commoncoil and the power-reception operation section and the second changeoverswitch on the path between the common coil and the data-transmissionoperation section is performed based on the detection results withtaking account of the frequency components of the signal received by thecommon coil from the outside (the feed unit). Accordingly, the circuit(the circuit in the above-described data-transmission operation section,and the like) is prevented from being damaged by the difference betweenthe system configuration at the time of the power transmission and thesystem configuration at the time of the data transmission.

In the electronic apparatus and the transmission system according to theembodiments of the disclosure, with use of the common coil, the powertransmitted through the power transmission with use of a magnetic fieldis received, and the mutual data transmission with use of a magneticfield is performed. Therefore, the number (kinds) of coils is allowed tobe reduced and cost reduction and downsizing are achievable. Inaddition, the switching control of ON/OFF state of each of the firstchangeover switch on the path between the common coil and thepower-reception operation section and the second changeover switch onthe path between the common coil and the data-transmission operationsection is performed based on the detection results with taking accountof the frequency components of the signal received by the common coilfrom the outside (the feed unit). Accordingly, the circuit is preventedfrom being damaged by the difference between the system configuration atthe time of the power transmission and the system configuration at thetime of the data transmission, thereby enhancing safety. As a result, atthe time of performing power transmission and data transmission with useof a magnetic field, the safety is allowed to be improved whileachieving cost reduction and downsizing.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view illustrating a configuration example of anappearance of a transmission system according to an embodiment of thedisclosure.

FIG. 2 is a block diagram illustrating a detailed configuration exampleof the transmission system illustrated in FIG. 1.

FIG. 3 is a circuit diagram illustrating a detailed configurationexample of a data transmission section and a demodulation sectionillustrated in FIG. 2.

FIG. 4 is a schematic diagram for explaining a relationship between afeed frequency and a data-transmission frequency.

FIGS. 5A to 5D are circuit diagrams each illustrating an example of animpedance matching circuit illustrated in FIG. 2.

FIGS. 6A to 6C are circuit diagrams illustrating other examples of theimpedance matching circuit illustrated in FIG. 2.

FIG. 7 is a circuit diagram illustrating a detailed configurationexample of a voltage detection section illustrated in FIG. 2.

FIG. 8 is a block diagram illustrating a configuration example of atransmission system according to a comparative example 1.

FIG. 9 is a block diagram illustrating a configuration example of atransmission system according to a comparative example 2.

FIG. 10 is a flowchart illustrating an example of a switching controloperation by a switch control section illustrated in FIG. 2.

DESCRIPTION OF EMBODIMENTS

An embodiment of the present disclosure will be described in detailbelow referring to the accompanying drawings. Note that descriptionswill be given in the following order.

1. Embodiment (Example in which changeover switches are controlled withtaking account of frequency components of a signal in a secondary-sideunit)

2. Modifications Embodiment [General Configuration of TransmissionSystem 4]

FIG. 1 illustrates a configuration example of an appearance of atransmission system (a transmission system 4) according to an embodimentof the disclosure, and FIG. 2 illustrates a block configuration exampleof the transmission system 4. The transmission system 4 is a system (anon-contact transmission system) performing non-contact powertransmission and non-contact data transmission (power feed andcommunication) with use of a magnetic field (with use of magneticresonance, electromagnetic induction, and the like; hereinafter thesame). The transmission system 4 includes a feed unit 1 (a primary-sideunit) and one or more electronic apparatuses (in this example, twoelectronic apparatuses 2A and 2B; secondary-side units) as units to befed with power.

As illustrated in FIG. 1, for example, in the transmission system 4, theelectronic apparatuses 2A and 2B are placed (or closely disposed) on afeeding surface (power transmission surface) of the feed unit 1 so thatthe feed unit 1 transmits power to the electronic apparatuses 2A and 2Bwith use of a magnetic field. In this case, in consideration of the casewhere power is transmitted to the plurality of electronic apparatuses 2Aand 2B at the same time or in a time-divisional manner (sequentially),the feed unit 1 has a mat shape (a tray shape) in which an area of thefeeding surface is larger than the size of the electronic apparatuses 2Aand 2B to be fed with power. In addition, in the transmission system 4,when the feed unit 1 and the electronic apparatuses 2A and 2B are closerto each other, mutual data transmission (bidirectional wirelesscommunication) with use of a magnetic field is performed between thefeed unit 1 and the electronic apparatuses 2A and 2B.

(Feed Unit 1)

As described above, the feed unit 1 is a unit (a charging tray)transmitting power to the electronic apparatuses 2A and 2B with use of amagnetic field, and performing mutual data transmission with theelectronic apparatuses 2A and 2B. As illustrated in FIG. 2, for example,the feed unit 1 includes a power-transmission operation section 11, adata-transmission operation section 12, and a common coil L1. Note thatthe common coil L1 is a coil commonly used as a power-transmission coil(a primary-side coil) and a data-transmission coil.

The power-transmission operation section 11 uses the common coil L1 totransmit power (perform power transmission operation) to the electronicapparatuses 2A and 2B with use of a magnetic field. Specifically, thepower-transmission operation section 11 performs power transmissionoperation radiating a magnetic field (magnetic flux) from the feedingsurface toward the electronic apparatuses 2A and 2B.

The data-transmission operation section 12 uses the common coil L1 toperform mutual data transmission with the electronic apparatuses 2A and2B (specifically, a data-transmission operation section 22 describedlater) with use of a magnetic field. As illustrated in FIG. 3, forexample, the data-transmission operation section 12 includes a signalsupply source 120, a transmit amplifier 121, a detection circuit 122, aresistor R1, and a capacitor C1. The signal supply source 120 suppliespredetermined signals for data transmission to the transmit amplifier121. The detection circuit 122 is a circuit detecting presence ofsignals from the counter party (herein, the data-transmission operationsection 22 described later) at the time of data transmission. A firstend of the resistor R1 is connected to a first output terminal of thetransmit amplifier 121, and a second end of the resistor R1 is connectedto each of an output terminal of the detection circuit 122, a first endof the capacitor C1, and a first end of the common coil L1. A second endof the capacitor C1 is connected to a second output terminal of thetransmit amplifier 121 and a second end of the common coil L1.

(Electronic Apparatuses 2A and 2B)

The electronic apparatuses 2A and 2B are stationary electronicapparatuses typified by a television receiver, mobile electronicapparatuses including a rechargeable battery (battery), typified by amobile phone and a digital camera, and the like. As illustrated in FIG.2, for example, each of the electronic apparatuses 2A and 2B includes acommon coil L2, a changeover switch SW1 (a first changeover switch), achangeover switch SW2 (a second changeover switch), a power-receptionoperation section 21, the data-transmission operation section 22, and aswitch control section 23.

The common coil L2 is a coil commonly used as a power-reception coil (asecondary-side coil) and a data-transmission coil. In other words, asillustrated by arrows P1 and D1 in FIG. 2, the common coil L2 receivespower transmitted from the common coil L1 in the feed unit 1, andperforms mutual data transmission with the common coil L1.

The power-reception operation section 21 uses the above-described commoncoil L2 to perform power-reception operation for receiving powertransmitted through power transmission with use of a magnetic field, andincludes an impedance matching circuit 211, a charging section 212, anda battery 213. The impedance matching circuit 211 is a circuitperforming impedance matching at the time of power transmission toimprove efficiency (transmission efficiency) at the time of powertransmission. The charging section 212 performs charging with respect tothe battery 213, based on power received by the common coil L2. Thebattery 213 stores power therein in response to the charging by thecharging section 212, and is configured by using a rechargeable battery(a secondary battery) such as a lithium-ion battery. Note that thedetailed configuration example of the impedance matching circuit 211will be described later (FIGS. 5A to 5D and FIGS. 6A to 6C).

The data-transmission operation section 22 uses the common coil L2 toperform mutual data transmission with the data-transmission operationsection 12 in the feed unit 1 with use of a magnetic field, and includesan impedance matching circuit 221 and a demodulation section 222. Theimpedance matching circuit 221 is a circuit performing impedancematching at the time of power transmission, similarly to theabove-described impedance matching circuit 211. The detailedconfiguration example of the impedance matching circuit 221 will also bedescribed later (FIGS. 5A to 5D and FIGS. 6A to 6C). The demodulationsection 222 performs demodulation operation at the time of datatransmission, and as illustrated in FIG. 3, for example, includes acapacitor C2, resistors R21 and R22, a transistor Tr2, and a signalsupply source 222A. In the demodulation section 222, a first end of eachof the capacitor C2 and the resistors R21 and R22 is connected to afirst end of the common coil L2, and a second end of each of thecapacitor C2 and the resistor R21 and a source of the transistor Tr2 areconnected to a second end of the common coil L2 and grounded. A secondend of the resistor R22 is connected to a drain of the transistor Tr2,and a gate of the transistor Tr2 is supplied with predetermined signalsfor demodulation operation from the signal supply source 222A.

The changeover switch SW1 is disposed on a path (a connection line Lc1)between the common coil L2 and the power-reception operation section 21.Switching of ON/OFF state of the changeover switch SW1 allows theconnection state between the common coil L2 and the power-receptionoperation section 21 to be switched. The changeover switch SW2 isdisposed on a path (a connection line Lc2) between the common coil L2and the data-transmission operation section 22. Switching of ON/OFFstate of the changeover switch SW2 allows the connection state betweenthe common coil L2 and the data-transmission operation section 22 to beswitched. Incidentally, each of the changeover switches SW1 and SW2 isconfigured by using a transistor, a MOSFET (metal-oxide-semiconductorfield-effect transistor), and the like. The switch control section 23 isdisposed on a first end side of a connection line Lc3. A second end sideof the connection line Lc3 is connected to the common coil L2. Theswitch control section 23 uses control signals CTL1 and CTL2 to performswitching control of ON/OFF state of each of the above-describedchangeover switches SW1 and SW2. In the embodiment, the switch controlsection 22 performs the switching control of the changeover switches SW1and SW2, based on detection results with taking account of frequencycomponents of a signal (a carrier) S2 received by the common coil L2from the outside (in this case, the feed unit 1). Specifically, theswitch control section 23 performs such switching control based on amagnitude of a signal level (a voltage and the like) of each of afrequency component for power transmission and a frequency component fordata transmission in the signal S2. Note that the detail of theswitching control operation by the switch control section 23 will bedescribed later (FIG. 10).

As illustrated in FIG. 2, for example, the switch control section 23includes an impedance matching circuit 231, two BPFs (band path filters)232A and 232B, three voltage detection sections 233, 233A, and 233B, anda control section 234. The impedance matching circuit 231 is a circuitperforming an impedance matching at the time of power transmission,similarly to the above-described impedance matching circuits 211 and221. Note that the detailed configuration example of the impedancematching circuit 231 will also be described later (FIGS. 5A to 5D, andFIGS. 6A to 6C).

The BPF 232A (a first filter) is a filter extracting a frequencycomponent for power transmission (a component of a feed frequency f1)from the above-described signal S2, and outputting the extractedcomponent as a signal S21. On the other hand, the BPF 232B (a secondfilter) is a filter extracting a frequency component for datatransmission (a component of a data-transmission frequency f2) from thesignal S2, and outputting the extracted component as a signal S22.

As illustrated in (A) and (B) of FIG. 4, the relationship between thefeed frequency f1 and the data-transmission frequency f2 is as follows.The feed frequency f1 and the data-transmission frequency f2 aredifferent from each other (f1≠f2), and as illustrated in (A) of FIG. 4,for example, the feed frequency f1 is lower than the data-transmissionfrequency f2 (f1<f2). Alternatively, as illustrated in (B) of FIG. 4,for example, the feed frequency f1 is higher than the data-transmissionfrequency f2 (f2<f1). Among them, although the detail will be describedlater, in consideration of the degree of the efficiency reduction (feedefficiency and the like) in a high frequency range, the case of (A) ofFIG. 4 (f1<f2) is more preferable than the case of (B) of FIG. 4(f2<f1). Incidentally, in the case of (A) of FIG. 4 (f1<f2), the feedfrequency f1 is a frequency of about 120 kHz or about 6.78 MHz, forexample, and the data transmission frequency f2 is 13.56 MHz, forexample.

The voltage detection section 233 (a first detection section) detects asignal level (herein, a voltage) of the entire signal S2 (including allof the frequency components) to output a detection result signal J(S2).On the other hand, the voltage detection section 233A (a seconddetection section) detects a signal level (herein, a voltage) of thesignal S21 (the component of the feed frequency f1 in the signal S2)extracted by the BPF 232A to output a detection result signal J(S21). Inaddition, the voltage detection section 233B (a third detection section)detects a signal level (herein, a voltage) of the signal S22 (thecomponent of the data-transmission frequency f2 in the signal S2)extracted by the BPF 232B to output a detection result signal J(S22).Note that the detailed configuration example of the voltage detectionsections 233, 233A, and 233B will be described later (FIG. 7).

The control section 234 generates and outputs the control signals CTL1and CTL2, based on the detection result signals J(S2), J(S21), andJ(S22) as the detection results by the voltage detection sections 233,233A, and 233B, respectively, and accordingly performs switching controlof each of the above-described changeover switches SW1 and SW2. Such acontrol section 234 is configured by using a microcomputer, for example.

[Detailed Configuration Example of Impedance Matching Circuits 211, 221,and 231]

FIGS. 5A to 5D and FIGS. 6A to 6C are circuit diagrams each illustratinga detailed configuration example of the above-described impedancematching circuits 211, 221, and 231.

In the example illustrated in FIG. 5A, in the impedance matchingcircuits 211, 221, and 231, a capacitor C3 s is connected in series withthe common coil L2. In the example illustrated in FIG. 5B, in theimpedance matching circuits 211, 221, and 231, a capacitor C3 p isconnected in parallel with the common coil L2. In each of the examplesillustrated in FIGS. 5C and 5D, in the impedance matching circuits 211,221, and 231, the capacitor C3 s is connected in series with the commoncoil L2, and the capacitor C3 p is connected in parallel with the commoncoil L2.

On the other hand, in the examples illustrated in FIGS. 6A to 6C,transistors Tr3 s and Tr3 p for switching the connection state of thecapacitor C3 s or C3 p are provided in the impedance matching circuits211, 221, and 231. Specifically, in the example illustrated in FIG. 6A,in the impedance matching circuits 211, 221, and 231 illustrated in FIG.5C, the transistor Tr3 p for switching the connection state of thecapacitor C3 p is connected in series with the capacitor C3 p. In theexample illustrated in FIG. 6B, capacitors C3 s 1 and C3 s 2 each areconnected in series with the common coil L2, the capacitor C3 p isconnected in parallel with the common coil L2, and the capacitors C3 s 1and C3 s 2 are connected in parallel with each other. In addition, thetransistor Tr3 s for switching the connection state of the capacitor C3s 2 is connected in series with the capacitor C3 s 2. In the exampleillustrated in FIG. 6C, in the impedance matching circuits 211, 221, and231 illustrated in FIG. 5C, the transistor Tr3 p for switching theconnection state of the capacitor C3 p is connected in series with thecapacitor C3 p. In addition, the transistor Tr3 s for switching theconnection state of the capacitor C3 s is connected in parallel with thecapacitor C3 s. With such transistors Tr3 s and Tr3 p thus provided, theconnection state of the capacitor C3 s or C3 p is switched in responseto the ON/OFF state of the transistors Tr3 s and Tr3 p, thereby enablingadjustment of the impedance matching.

[Detailed Configuration Example of Voltage Detection Sections 233, 233A,and 233B]

FIG. 7 is a circuit diagram illustrating the detailed configurationexample of the above-described voltage detection sections 233, 233A, and233B. In this example, each of the voltage detection sections 233, 233A,and 233B includes a rectification circuit 51, a threshold voltage outputsection 52, a comparator 53, and two resistors R51 and R52.

The rectification circuit 51 is a circuit rectifying the signal S2 (anAC signal) input from the common coil L2 through the impedance matchingcircuit 231, and accordingly outputting a signal converted from the ACvoltage to the DC voltage. The threshold voltage output section 52outputs one of four threshold voltages Vth11, Vth12, Vth21, and Vth22which will be described later to input terminal on the negative (−) sideof the comparator 53. The threshold voltage output section 52 includes apredetermined power supply circuit and the like. Each of the resistorsR51 and R52 is a resistor dividing a DC voltage output from therectification circuit 51. A first end of the resistor R51 is connectedto an output terminal of the rectification circuit 51, and a second endof the resistor R51 is connected to a first end of the resistor R52 andan input terminal on the positive (+) side of the comparator 53. Asecond end of the resistor R52 is grounded. With this configuration,detection voltages V(S2), V(S21), and V(S22) as the detection voltagesof the signals S2, S21, and S22 are supplied to the input terminal onthe positive side of the comparator 53.

The comparator 53 is a circuit comparing a magnitude of one of thedetection voltages V(S2), V(S21), and V(S22) supplied to the inputterminal on the positive side with a magnitude of one of the thresholdvoltages Vth11, Vth12, Vth21, and Vth22 supplied to the input terminalon the negative side. Accordingly, the above-described detection resultsignal J(S2), J(S21), or J(S22) (for example, a binary signal of “L(low)” or “H (high)” corresponding to the comparison result) as acomparison result is output from the output terminal of the comparator53. Note that the detail of the comparison operation between thedetection voltages V(S2), V(S21), and V(S22) and the threshold voltagesVth11, Vth12, Vth21, and Vth22 will be described later (FIG. 10).

Incidentally, the configuration of the voltage detection sections 233,233A, and 233B is not limited to the configuration illustrated in FIG.7. Specifically, for example, a circuit configuration in which apredetermined digital processing is performed after the input signal S2(an analog signal) is converted into a digital signal by an A/D(analog/digital) converter may be available.

[Functions and Effects of Transmission System 4] (1. Outline of GeneralOperation)

In the transmission system 4, the power-transmission operation section11 of the feed unit 1 supplies a predetermined high frequency power (ACsignal) for performing power transmission to the common coil L1. As aresult, a magnetic field (magnetic flux) is generated in the common coilL1. At this time, when the electronic apparatuses 2A and 2B as units tobe fed with power (units to be charged) are placed (or closely disposed)on the top surface (the feeding surface) of the feed unit 1, the commoncoil L1 in the feed unit 1 and the common coil L2 of the electronicapparatuses 2A and 2B come close to each other near the feeding surface.

In this way, when the common coil L2 is closely disposed to the commoncoil L1 from which the magnetic field (magnetic flux) is generated,electromotive force is generated in the common coil L2 by induction ofthe magnetic flux generated from the common coil L1. In other words,interlinkage magnetic field is generated in each of the coil L1 and thecoil L2 by electromagnetic induction or magnetic resonance. As a result,power is transmitted (fed) from the common coil L1 side (primary side,the feed unit 1 side) to the common coil L2 side (secondary side, theelectronic apparatuses 2A and 2B side) (see power P1 illustrated in FIG.2). At this time, on the feed unit 1 side, for example, LC resonanceoperation using the common coil L1 and a capacitor (not shown) isperformed, and on the electronic apparatuses 2A and 2B side, LCresonance operation using the common coil L2 and a capacitor (not shown)is performed.

Then, in the electronic apparatuses 2A and 2B, the following chargingoperation is performed in the power-reception operation section 21,based on the power (AC power) received by the common coil L2. With thecharging section 212, the battery 213 is charged after the AC power isconverted into a predetermined DC power, for example. In this way, inthe electronic apparatuses 2A and 2B, the charging operation based onthe power received by the common coil L2 is performed.

Specifically, in the embodiment, terminal connection to the AC adaptoror the like is not necessary for charging the electronic apparatuses 2Aand 2B, and charging is easily started (non-contact feeding isperformed) by only placing (or closely disposing) the electronicapparatuses 2A and 2B on the feeding surface of the feed unit 1. Thisleads to liability relief of a user.

Moreover, in the transmission system 4, as illustrated by the arrow D1in FIG. 2, non-contact mutual data transmission is performed between thedata-transmission operation section 12 in the primary-side unit (thefeed unit 1) and the data-transmission operation section 22 in thesecondary-side unit (the electronic apparatuses 2A and 2B), with use ofa magnetic field. Specifically, when the common coil L1 in the feed unit1 and the common coil L2 in the electronic apparatuses 2A and 2B comeclose to each other, mutual data transmission with use of a magneticfield is performed. Accordingly, data transmission is allowed to beperformed only by allowing the feed unit 1 and the electronicapparatuses 2A and 2B to come close to each other, without connectingwirings for data transmission between the feed unit 1 and the electronicapparatuses 2A and 2B. In other words, liability relief of a user isachievable in this point.

(2. Switching Control Operation of Changeover Switches SW1 and SW2)

Next, control operation (switching control operation) of the changeoverswitches SW1 and SW2 by the switch control section 23 that is one offeatures of the embodiment will be described in detail with comparing tocomparative examples (comparative examples 1 and 2).

Comparative Example 1

FIG. 8 illustrates a block configuration of a transmission system (atransmission system 104) according to a comparative example 1. Thetransmission system 104 of the comparative example 1 includes the feedunit 1 and two electronic apparatuses 102A and 102B.

Each of the electronic apparatuses 102A and 102B includes thepower-reception operation section 21, the data-transmission operationsection 22, a power-reception coil L21, and a data-transmission coilL22. In other words, different from the common coil L2 in the electronicapparatuses 2A and 2B of the embodiment, the power-reception coil L21and the data-transmission coil L22 are separately provided.

The power-reception coil L21 and the data-transmission coil L22 areseparately provided in this way for the following reason. Transmissionis basically performed in accordance with the same principle (with useof a magnetic field) in two non-contact transmission systems (powertransmission system and data transmission system). However, thefollowing two large different points are present between the systems.

Firstly, the applied power (voltage) is largely different between thesystems. Specifically, in the non-contact data-transmission system(NFC), the received power is a power necessary for driving an IC(integrated circuit) (about several mW to about several tens mW),whereas in the non-contact power-transmission system, the received poweris about several W. Therefore, voltage resistance of the IC in thesystem is also largely different, and when a voltage equivalent to thevoltage applied to the power transmission system is applied to the datatransmission system, the circuit is possibly damaged by overvoltage.

Secondly, the applied frequency is largely different between the systems(the feed frequency f1 and the data-transmission frequency f2 aredifferent from each other) as described with referring to (A) and (B) ofFIG. 4. Specifically, in the non-contact data transmission system (NFC),the use of a carrier having the data-transmission frequency f2 of 13.56MHz is defined by international standard. On the other hand, in thenon-contact power-transmission system, a frequency is selected from theviewpoint of regulations, efficiency, and the like, due to large powerin feeding. For example, in the non-contact power-transmission system,if the frequency (the feed frequency f1) is high, loss in the circuit isincreased and the degree of efficiency reduction (feed efficiency andthe like) is possibly increased. Therefore, in the presentcircumstances, as the feed frequency f1, a frequency of around 120 kHzor around 6.78 MHz is supported by standardization associations.

Caused by the difference of the system configuration between in thepower-transmission system and in the data-transmission system, in thetransmission system 104 of the comparative example 1, thepower-reception coil L21 and the data-transmission coil L22 areseparately provided as described above. However, when these coils areprovided separately, its manufacturing cost and its mounting area arelargely restricted. In other words, in the comparative example 1, it isdifficult to achieve cost reduction and downsizing.

Comparative Example 2

On the other hand, a transmission system (a transmission system 204)according to a comparative example 2 illustrated in FIG. 9 includes thefeed unit 1 and two electronic apparatuses 202A and 202B each includingthe common coil L2. Specifically, in the comparative example 2, thecommon coil L2 commonly used as the power-reception coil and thedata-transmission coil is employed so that the number (kinds) of coilsis reduced compared with the comparative example 1, and cost reductionand downsizing are achieved.

Each of the electronic apparatuses 202A and 202B includes thepower-reception operation section 21, the data-transmission operationsection 22, the common coil L2, the changeover switches SW1 and SW2, anda switch control section 203. In other words, each of the electronicapparatuses 202A and 202B is configured by providing the switch controlsection 203 in the electronic apparatuses 2A and 2B of the embodiment,in place of the switch control section 23.

The switch control section 203 includes the impedance matching circuit231, the voltage detection section 233, and the control section 234. Inother words, the switch control section 203 is configured by removing(not providing) the BPFs 232A and 232B and the voltage detectionsections 233, 233A, and 233B from the switch control section 23.Therefore, the switch control section 203 generates and outputs thecontrol signals CTL1 and CTL2, based on the detection result signalJ(S2) (a detection result of the entire signal S2) by the voltagedetection section 233, thereby performing the switching control of thechangeover switches SW1 and SW2.

Incidentally, the transmission system 204 of the comparative example 2has disadvantages as follows. The switching control operation isperformed only using the detection result of the entire signal S2.Therefore, for example, when the signal S2 having high signal level(voltage) is applied abruptly, there is a possibility that the circuitin the data-transmission operation section 22 is still in a valid state(the changeover switch SW2 is in the ON state). Therefore, when thedata-transmission operation section 22 is in the valid state, if themode is switched from the data transmission mode to the powertransmission mode on the feed unit 1 side, the circuit in thedata-transmission operation section 22 is possibly damaged byovervoltage.

As a method of preventing a circuit from being damaged by suchovervoltage, a method in which the voltage is decreased (overvoltage isprevented from being applied) by providing load resistances in theelectronic apparatuses 202A and 202B so that the voltage is variedaccording to (by following) the positional relationship between the feedunit 1 and the electronic apparatuses 202A and 202B is considered.However, even if the method is employed, it is difficult for the methodto handle the case where the unexpected high voltage is abruptlyapplied, and in such a case, it is considered that the circuit isdamaged before the voltage follows.

As described above, in the comparative examples 1 and 2, it is difficultto achieve cost reduction and downsizing as well as to improve safety atthe time of power transmission and data transmission with use of amagnetic field.

Embodiment

In contrast, in the electronic apparatuses 2A and 2B of the embodiment,the switch control section 23 performs control operation (switchingcontrol operation) of the changeover switches SW1 and SW2 in thefollowing manner. The switch control section 23 performs such switchingcontrol, based on the detection results with taking account of thefrequency components of the signal S2 received by the common coil L2from the outside (the feed unit 1). In other words, the switchingcontrol operation is performed not by using only the detection resultsof the entire signal S2 like in the comparative example 2, but by takingaccount of the frequency components of the signal S2.

More specifically, the switch control section 23 performs switchingcontrol based on the magnitude of the signal level of each of thefrequency component for the power transmission and the frequencycomponent for the data transmission in the signal S2. In addition, atthis time, the switch control section 23 performs such switching controlwith use of a comparison result of the signal level of each of thefrequency component for the power transmission and the frequencycomponent for the data transmission (each component of the feedfrequency f1 and the data-transmission frequency f2 in the signal S2)and predetermined threshold voltages Vth21 and Vth22 (carrierthresholds), as will be described later.

In the embodiment, unlike the comparative example 2, with such aswitching control operation, the circuit (for example, the circuit inthe data-transmission operation section 22) is prevented from beingdamaged by the difference between the system configuration at the timeof the power transmission and the system configuration at the time ofthe data transmission.

FIG. 10 is a flowchart illustrating an example of the switching controloperation by the switch control section 23 of the embodiment.

In this example, first, the voltage detection section 233 in the switchcontrol section 23 detects the detection voltage V(S2) as the signallevel of the entire signal S2 (step S101). Then, the voltage detectionsection 233 determines whether the detection voltage V(S2) is largerthan the predetermined threshold voltage Vth11 (a first entirethreshold) (V(S2)>Vth11), or the voltage detection section 233 comparesthe magnitudes of the voltage values (step S102).

At this time, when the detection voltage V(S2) is larger than thethreshold voltage Vth11 (V(S2)>Vth11) (step S102: Y), the controlsection 234 performs a predetermined error processing, based on thedetection result signal J(S2) indicating the determination result (stepS103). Specifically, in this case, the control section 234 determinesthat a high voltage not performing the power transmission and the datatransmission is applied, and controls the process to be returned to afirst process (step S101) without performing switching control describedbelow. On the other hand, when the detection voltage V(S2) is equal toor lower than the threshold voltage Vth11 (V(S2)≦Vth11) (step S102: N),the voltage detection sections 233A and 233B each then detect the signallevel of the frequency components of the signal S2 (step S104).Specifically, the voltage detection section 233A detects the detectionvoltage V(S21) as a signal level of the component (signal S21) of thefeed frequency f1 in the signal S2. In addition, the voltage detectionsection 233B detects the detection voltage V(S22) as a signal level ofthe component (signal S22) of the data-transmission frequency f2 in thesignal S2. Then, the voltage detection section 233A determines whetherthe detection voltage V(S21) is equal to or larger than thepredetermined threshold voltage Vth21 (the first carrier threshold)(V(S21)≧Vth21), or the voltage detection section 233A compares themagnitudes of the voltage values (step S105).

In this way, only when the signal level of the entire signal S2 is equalto or smaller than the threshold voltage Vth11 (step S102: N), theswitch control section 23 performs comparison between the detectionvoltage V(S21) and the threshold voltage Vth21 (step S105) and switchingcontrol of the changeover switches SW1 and SW2, which will be describedbelow. Accordingly, the circuits and the like in the power-receptionoperation section 21 and the data transmission section 22 are preventedfrom being damaged by the abrupt high voltage application.

At this time, when the detection voltage V(S21) is equal to or largerthan the threshold voltage Vth21 (V(S21)≧Vth21) (step S105: Y), thecontrol section 234 outputs the control signal CTL1 to allow thechangeover switch SW1 to be in the ON state, based on the detectionresult signal J(S21) indicating the determination result. Accordingly, aperiod during which the changeover switch SW1 is in the ON state isestablished, that is, the mode is changed into the power transmissionmode (feeding mode) in which the operation of the power-receptionoperation section 21 is in the valid state (step S106). After that, theprocess returns to the first process (step S101). On the other hand,when the detection voltage V(S21) is smaller than the threshold voltageVth21 (V(S21)<Vth21) (step S105: N), the control section 234 outputs thecontrol signal CTL1 to allow the changeover switch SW1 to be in the OFFstate (step S107). Then, the voltage detection section 233B determineswhether the detection voltage V(S22) is equal to or larger than thepredetermined threshold voltage Vth22 (the second carrier threshold)(V(S22)≧Vth22), or the detection voltage section 233B compares themagnitudes of the voltage values (step S108).

At this time, when the detection voltage V(S22) is equal to or largerthan the threshold voltage Vth22 (V(S22)≧Vth22) (step S108: Y), thevoltage detection section 233 performs comparison of the magnitudes ofthe voltage values described below. Specifically, the voltage detectionsection 233 determines whether the detection voltage V(S2) is largerthan the predetermined threshold voltage Vth12 (a second entirethreshold) (V(S2)>Vth12) (step S109). Note that the threshold voltageVth12 is smaller than the above-described threshold voltage Vth11, inother words, the threshold voltage Vth11 is larger than the thresholdvoltage Vth12 (Vth12<Vth11). On the other hand, when the detectionvoltage V(S22) is smaller than the threshold voltage Vth22(V(S22)<Vth22) (step S108: N), the control section 234 outputs thecontrol signal CTL2 to allow the changeover switch SW2 to be in the OFFstate, based on the detection result signal J(S22) indicating thedetermination result (step S110).

At this time, when the detection voltage V(S2) is larger than thethreshold voltage Vth12 (V(S2)>Vth12) (step S109: Y), the controlsection 234 outputs the control signal CTL2 to allow the changeoverswitch SW2 to be in the OFF state, based on the detection result signalJ(S2) indicating the determination result (step S110). On the otherhand, when the detection voltage V(S2) is equal to or smaller than thethreshold voltage Vth12 (V(S2)≦Vth12) (step S109: N), the controlsection 234 outputs the control signal CTL2 to allow the changeoverswitch SW2 to be in the ON state. As a result, a period during which thechangeover switch SW2 is in the ON state is established, that is, themode is changed into the data transmission mode (communication mode) inwhich the operation of the data-transmission operation section 22 is inthe valid state (step S111). After that, the process returns to thefirst process (step S101).

In this way, when the detection voltage V(S22) is equal to or largerthan the threshold voltage Vth22 (step S108: Y) and only in the casewhere the detection voltage V(S2) is equal to or smaller than thethreshold voltage Vth12 (step S109: N), the switch control section 23controls the changeover switch SW2 to be in the ON state. Accordingly,the circuit (the circuit in the data-transmission operation section, andthe like) is prevented from being damaged by the difference between thesystem configuration (configuration of the power-reception operationsection 21) at the time of the power transmission and the systemconfiguration (configuration of the data-transmission operation section22) at the time of data transmission.

Subsequently, after the step S110, whether the entire control processing(switching control operation) by the switch control section 23 isallowed to be ended is determined (step S112). Then, when it isdetermined that the control processing is allowed not to be ended (stepS112: N), the process returns to the first process (step S101), and whenit is determined that the control processing is allowed to be ended(step S112: Y), the entire control processing illustrated in FIG. 10 isended.

In this way, in the embodiment, with use of the common coil L2, thepower transmitted through the power transmission with use of a magneticfield is received, and the mutual data transmission with use of amagnetic field is performed. Specifically, since both the powerreception operation and the data transmission operation are performedwith use of single common coil L2, the number (kinds) of coils isallowed to be reduced, compared with the case where these operations areperformed with use of the dedicated coils (the power reception coil L21and the data transmission coil L22) like the above-described comparativeexample 1.

Moreover, the switching control of ON/OFF state of each of thechangeover switch SW1 on the path between the common coil L2 and thepower-reception operation section 21 and the changeover switch SW2 onthe path between the common coil L2 and the data-transmission operationsection 22 is performed based on the detection results with takingaccount of the frequency components of the signal S2 received by thecommon coil L2 from the outside (the feed unit 1). As a result, unlikethe above-described comparative example 2, the circuit (the circuit inthe data-transmission operation section 22, and the like) is preventedfrom being damaged by the difference between the system configuration atthe time of the power transmission and the system configuration at thetime of the data transmission.

Specifically, as described above, for example, in the case where thehigh voltage signal S2 is abruptly applied, even when the circuit in thedata-transmission operation section 22 is still in the valid state (thechangeover switch SW2 is in the ON state), such a damage of the circuitis avoided. In other words, in such a case, it is expected that thesignal level (the voltage V(S22)) of the component of thedata-transmission frequency f2 in the signal S2 is dropped at the momentwhen the mode is changed from the data transmission mode to the powertransmission mode on the feed unit 1 side. Therefore, the switchingcontrol is performed to allow the changeover switch SW2 to be in the OFFstate.

As described above, in the embodiment, with use of the common coil L2,the power transmitted through the power transmission with use of amagnetic field is received, and the mutual data transmission with use ofa magnetic field is preformed. Therefore, the number (kinds) of coils isallowed to be reduced, and cost reduction and downsizing are achievable.In addition, the switching control of the ON/OFF state of the changeoverswitch SW1 on the path between the common coil L2 and thepower-reception operation section 21 and the changeover switch SW2 onthe path between the common coil L2 and the data-transmission operationsection 22 is performed based on the detection results with takingaccount of the frequency components of the signal S2 received by thecommon coil L2 from the outside (the feed unit 1). As a result, thecircuit is prevented from being damaged by the difference between thesystem configuration at the time of the power transmission and thesystem configuration at the time of the data transmission, therebyimproving safety. Consequently, at the time of performing the powertransmission and the data transmission with use of a magnetic field,safety is allowed to be improved while cost reduction and downsizing areachieved.

Moreover, the value of the feed frequency f1 is allowed to beselectable, and the circuit in each of the power transmission system andthe data transmission system is allowed to use the existing IC as it is(change of the design or the like is not necessary).

[Modifications]

Hereinbefore, although the technology of the disclosure has beendescribed with referring to the embodiment, the technology is notlimited to the embodiment, and various modifications may be made.

For example, various kinds of configurations are allowed to be used asthe configuration (shape) of each coil (common coil) described in theembodiment. Specifically, each coil is allowed to be configured inshapes such as a spiral shape, a loop shape, a bar shape using amagnetic body, an alpha-wound shape configured by folding a spiral coilinto two layers, a multilayer spiral shape, a helical shape configuredby winding a wire in a thickness direction thereof. Moreover, each coilis not limited to a winding coil configured of a conductive wire rod,and may be a conductive patterned coil configured of a printed board, aflexible printed board, or the like.

In addition, in the above-described embodiment, although the electronicapparatus has been described as an example of a unit to be fed withpower, the unit to be fed with power is not limited thereto, and may beother than the electronic apparatus (for example, vehicles such aselectric cars).

Furthermore, in the above-described embodiment, the components of eachof the feed unit and the electronic apparatuses have been specificallydescribed. However, all of the components are not necessarily provided,and other components may be further provided. For example, in the feedunit or the electronic apparatus, a communication function, a controlfunction, a display function, a function of authenticating asecondary-side unit, a function of determining whether a secondary-sideunit is placed on a primary-side unit, a function of detecting acontaminant such as a dissimilar metal, and the like may be provided.Moreover, in the feed unit, a single common coil like in theabove-described embodiment is not provided, but a power transmissioncoil and a data transmission coil may be provided separately.

In addition, in the above-described embodiment, the case where thetransmission system includes a plurality of (two) electronic apparatuseshas been described as an example. However, the number of electronicapparatuses is not limited thereto, and the transmission system mayinclude only one electronic apparatus.

Moreover, in the above-described embodiment, the charging tray for asmall electronic apparatus (CE device) such as a mobile phone has beendescribed as an example of the feed unit. However, the feed unit is notlimited to such a household charging tray, and is applicable as acharging unit for various electronic apparatuses, and the like. Inaddition, the feed unit is not necessarily a tray, and may be a standfor electronic apparatuses such as a so-called cradle.

In one embodiment, an electronic apparatus includes a switch controlsection configured to: determine whether a received signal is any one ofa power signal and a data signal based on the received signal, andselect any one of a power-reception operation and a data-transmissionoperation based on the determination of the received signal. In anembodiment, the electronic apparatus further includes a coilelectrically connected to the switch control section thereby allowingselection of any one of the power-reception operation and thedata-transmission operation. In an embodiment, the coil is configured tobe electromagnetically coupled to a second coil of a feed unit towirelessly receive any one of the power signal and the data signal fromthe feed unit. In an embodiment, the electronic apparatus includes amobile electronic apparatus and the battery is a rechargeable battery.In an embodiment, the data-transmission operation is configured totransmit signals generated by a signal supply source. In an embodiment,the switch control section includes: a first filter configured to filterthe received signal associated with a first frequency component; a firstvoltage detection circuit configured to determine if the first frequencycomponent exceeds a first voltage threshold; a second filter configuredto filter the received signal associated with a second frequencycomponent; and a second voltage detection circuit configured todetermine if the second frequency component exceeds a second voltagethreshold, and wherein the switch control section is configured todetermine that the received signal is to be transmitted to: apower-reception operation section if the first voltage detection circuitdetermines the first frequency component exceeds the first voltagethreshold; and a data-transmission operation section if the secondvoltage detection circuit determines the second frequency componentexceeds the second voltage threshold. In an embodiment, the electronicapparatus further includes a third voltage detection circuit configuresto determine if the received signal exceeds a third voltage threshold.In an embodiment, the switch control section performs error processingif the third voltage detection circuit determines the received signalexceeds the third voltage threshold. In an embodiment, error processingincludes the control section refraining from transmitting the receivedwireless signal to any one of the power-reception operation section andthe data-transmission operation section. In an embodiment, the firstvoltage detection circuit includes: a first rectification circuit toconvert the first frequency component into a first direct currentsignal; and a first comparator to determine if a magnitude first directcurrent signal exceeds a magnitude of the first voltage threshold; andthe second voltage detection circuit includes: a second rectificationcircuit to convert the second frequency component into a second directcurrent signal; and a second comparator to determine if a magnitude thesecond direct current signal exceeds a magnitude the second voltagethreshold. In an embodiment, the switch control section is configuredto: transmit a first control signal to a first switch causing the firstswitch to route the received signal to the power-reception operationsection if the first frequency component exceeds the first voltagethreshold; and transmit a second control signal to a second switchcausing the second switch to route the received signal to thedata-transmission operation section if the second frequency componentexceeds the second voltage threshold. In an embodiment, the switchcontrol section is configured to be prevented from outputting the firstcontrol signal simultaneously with the second control signal. In anembodiment, the first filter is configured to filter the received signalfor frequencies substantially around 120 kilohertz (kHz) or 6.78megahertz (MHz). In an embodiment, the first filter is configured to beselectable between frequencies substantially around 120 kilohertz (kHz)or 6.78 megahertz (MHz). In an embodiment, the second filter isconfigured to filter the received signal for frequencies substantiallyaround 13.56 megahertz (MHz). In an embodiment, the switch controlsection is configured to perform switching control by selecting any oneof a power-reception operation and a data-transmission operation basedon a magnitude of a signal level of the received signal of each of afrequency component for the power transmission and a frequency componentfor the data transmission in the signal. In an embodiment, the switchcontrol section performs the switching control with use of comparisonresults between a predetermined carrier threshold and the signal levelof each of the frequency component for the power transmission and thefrequency component for the data transmission. In an embodiment, theswitch control section controls a first changeover switch to be in theON state when the signal level of the frequency component for the powertransmission is equal to or larger than a first carrier threshold, andcontrols the first changeover switch to be in the OFF state when thesignal level of the frequency component for the power transmission issmaller than the first carrier threshold.

In another embodiment, a method of routing a received wireless signalbased on a frequency is provided. The method includes: receiving asignal wirelessly from a feed unit via magnetic inductance; applying afirst filter to the received signal to generate a first frequencycomponent; applying a second filter to the received signal to generate asecond frequency component; routing the received signal to apower-reception operation section if a magnitude of the first frequencycomponent exceeds a first voltage threshold; and routing the receivedsignal to a data-transmission operation section if a magnitude of thesecond frequency component exceeds a second voltage threshold. In anembodiment, the method further includes: determining whether thereceived signal is greater than a third voltage threshold prior torouting the received signal; and performing error processing on thereceived signal if the received signal is greater than the third voltagethreshold. In an embodiment, error processing includes routing thereceived signal to a ground potential instead of routing the receivedsignal to the data-transmission operation section or the power-receptionoperation section. In an embodiment, the received signal and subsequentreceived signals are routed to the power-reception operation section solong as a magnitude of the first frequency component of the subsequentreceived signals exceeds the first voltage threshold. In an embodiment,the received signal and subsequent received signals are routed to thedata-transmission operation section so long as a magnitude of the secondfrequency component of the subsequent received signals exceeds thesecond voltage threshold and a magnitude of the first frequencycomponent of the subsequent received signals is less than the firstvoltage threshold.

In another embodiment, an electronic system includes: a transmitterconfigured to wirelessly transmit a power signal and a data signal; anelectronic device wirelessly communicatively coupled to the transmitter,the electronic device including: a switch control section to: determinewhether a signal received from the transmitter is the power signal orthe data signal based on a frequency component of the received signal;and select any one of a power-reception operation and adata-transmission operation based on the determination of the receivedsignal. In an embodiment, the electronic device includes an inductioncoil that is electromagnetically coupled to a second induction coilincluded within the transmitter. In an embodiment, the transmitter is acharging tray. In an embodiment, the transmitter includes a detectioncircuit configured to detect a second data signal from the electronicdevice. In an embodiment, the transmitter suspends transmitting thepower signal when the detection circuit detects the second data signal.

Note that the technology may be configured as follows.

(1) An electronic apparatus including:

a common coil;

a power-reception operation section using the common coil to receivepower transmitted through power transmission with use of a magneticfield;

a data-transmission operation section using the common coil to performmutual data transmission with use of a magnetic field;

a first changeover switch disposed on a path between the common coil andthe power-reception operation section;

a second changeover switch disposed on a path between the common coiland the data-transmission operation section; and

a switch control section performing switching control of ON/OFF state ofeach of the first and second changeover switches, based on detectionresults with taking account of frequency components of a signal receivedby the common coil from outside.

(2) The electronic apparatus according to (1), wherein the switchcontrol section performs the switching control, based on a magnitude ofa signal level of each of a frequency component for the powertransmission and a frequency component for the data transmission in thesignal.

(3) The electronic apparatus according to (2), wherein the switchcontrol section performs the switching control with use of comparisonresults between a predetermined charier threshold and the signal levelof each of the frequency component for the power transmission and thefrequency component for the data transmission.

(4) The electronic apparatus according to (3), wherein the switchcontrol section controls the first changeover switch to be in the ONstate when the signal level of the frequency component for the powertransmission is equal to or larger than a first carrier threshold, andcontrols the first changeover switch to be in the OFF state when thesignal level of the frequency component for the power transmission issmaller than the first carrier threshold.

(5) The electronic apparatus according to (4), wherein the switchcontrol section performs comparison between the signal level of thefrequency component for the power transmission and the first carrierthreshold only when the signal level of the entire signal is equal to orsmaller than a first entire threshold.

(6) The electronic apparatus according to any one of (3) to (5), whereinthe switch control section performs comparison between the signal levelof the entire signal and a second entire threshold when the signal levelof the frequency component for the data transmission is equal to orlarger than a second carrier threshold, and controls the secondchangeover switch to be in the OFF state when the signal level of thefrequency component for the data transmission is smaller than the secondcarrier threshold.

(7) The electronic apparatus according to (6), wherein the switchcontrol section controls the second changeover switch to be in the ONstate when the signal level of the frequency component for the datatransmission is equal to or larger than the second carrier threshold andonly when the signal level of the entire signal is equal to or smallerthan the second entire threshold.

(8) The electronic apparatus according to (6) or (7), wherein the switchcontrol section performs the switching control only when the signallevel of the entire signal is equal to or smaller than a first entirethreshold, the first entire threshold being larger than the secondentire threshold.

(9) The electronic apparatus according to any one of (2) to (8), whereinthe switch control section includes:

a first filter extracting the frequency component for the powertransmission from the signal;

a second filter extracting the frequency component for the datatransmission from the signal;

a first detection section detecting a signal level of the entire signal;

a second detection section detecting a signal level of the frequencycomponent for the power transmission extracted by the first filter;

a third detection section detecting a signal level of the frequencycomponent for the data transmission extracted by the second filter; and

a control section performing the switching control, based on detectionresults by the first to third detection sections.

(10) The electronic apparatus according to any one of (1) to (9),wherein

a power transmission mode allowing the operation of the power-receptionoperation section to be valid is established during a period in whichthe first changeover switch is in the ON state, and

a data transmission mode allowing the operation of the data-transmissionoperation section to be valid is established during a period in whichthe second changeover switch is in the ON state.

(11) A transmission system including one or more electronic apparatusesand a feed unit, the feed unit performing power transmission to theelectronic apparatuses with use of a magnetic field and performingmutual data transmission with the electronic apparatuses, each of theelectronic apparatuses including:

a common coil;

a power-reception operation section using the common coil to receivepower transmitted through the power transmission;

a data-transmission operation section using the common coil to performthe data transmission;

a first changeover switch disposed on a path between the common coil andthe power-reception operation section;

a second changeover switch disposed on a path between the common coiland the data-transmission operation section; and

a switch control section performing switching control of ON/OFF state ofeach of the first and second changeover switches, based on detectionresults with taking account of frequency components of a signal receivedby the common coil from the feed unit.

The present disclosure contains subject matter related to that disclosedin Japanese Priority Patent Application JP 2011-244320 filed in theJapan Patent Office on Nov. 8, 2011, the entire content of which ishereby incorporated by reference.

It should be understood by those skilled in the art that variousmodifications, combinations, sub-combinations, and alterations may occurdepending on design requirements and other factors insofar as they arewithin the scope of the appended claims or the equivalents thereof.

1. An electronic apparatus comprising: a switch control sectionconfigured to: determine whether a received signal is any one of a powersignal and a data signal based on the received signal; and select anyone of a power-reception operation and a data-transmission operationbased on the determination of the received signal.
 2. The electronicapparatus of claim 1, further comprising a coil electrically connectedto the switch control section thereby allowing selection of any one ofthe power-reception operation and the data-transmission operation. 3.The electronic apparatus of claim 2, further comprising wherein the coilis configured to be electromagnetically coupled to a second coil of afeed unit to wirelessly receive any one of the power signal and the datasignal from the feed unit.
 4. The electronic apparatus of claim 1,wherein the electronic apparatus includes a mobile electronic apparatusand the battery is a rechargeable battery.
 5. The electronic apparatusof claim 1, wherein the data-transmission operation is configured totransmit signals generated by a signal supply source.
 6. The electronicapparatus of claim 1, wherein the switch control section includes: afirst filter configured to filter the received signal associated with afirst frequency component; a first voltage detection circuit configuredto determine if the first frequency component exceeds a first voltagethreshold; a second filter configured to filter the received signalassociated with a second frequency component; and a second voltagedetection circuit configured to determine if the second frequencycomponent exceeds a second voltage threshold, and wherein the switchcontrol section is configured to determine that the received signal isto be transmitted to: a power-reception operation section if the firstvoltage detection circuit determines the first frequency componentexceeds the first voltage threshold; and a data-transmission operationsection if the second voltage detection circuit determines the secondfrequency component exceeds the second voltage threshold.
 7. Theelectronic apparatus of claim 6, further comprising a third voltagedetection circuit configures to determine if the received signal exceedsa third voltage threshold.
 8. The electronic apparatus of claim 7,wherein the switch control section performs error processing if thethird voltage detection circuit determines the received signal exceedsthe third voltage threshold.
 9. The electronic apparatus of claim 7,wherein error processing includes the control section refraining fromtransmitting the received wireless signal to any one of thepower-reception operation section and the data-transmission operationsection.
 10. The electronic apparatus of claim 6, wherein: the firstvoltage detection circuit includes: a first rectification circuit toconvert the first frequency component into a first direct currentsignal; and a first comparator to determine if a magnitude first directcurrent signal exceeds a magnitude of the first voltage threshold; andthe second voltage detection circuit includes: a second rectificationcircuit to convert the second frequency component into a second directcurrent signal; and a second comparator to determine if a magnitude thesecond direct current signal exceeds a magnitude the second voltagethreshold.
 11. The electronic apparatus of claim 6, wherein the switchcontrol section is configured to: transmit a first control signal to afirst switch causing the first switch to route the received signal tothe power-reception operation section if the first frequency componentexceeds the first voltage threshold; and transmit a second controlsignal to a second switch causing the second switch to route thereceived signal to the data-transmission operation section if the secondfrequency component exceeds the second voltage threshold.
 12. Theelectronic apparatus of claim 11, wherein the switch control section isconfigured to be prevented from outputting the first control signalsimultaneously with the second control signal.
 13. The electronicapparatus of claim 6, wherein the first filter is configured to filterthe received signal for frequencies substantially around 120 kilohertz(kHz) or 6.78 megahertz (MHz).
 14. The electronic apparatus of claim 13,wherein the first filter is configured to be selectable betweenfrequencies substantially around 120 kilohertz (kHz) or 6.78 megahertz(MHz).
 15. The electronic apparatus of claim 6, wherein the secondfilter is configured to filter the received signal for frequenciessubstantially around 13.56 megahertz (MHz).
 16. The electronic apparatusof claim 1, wherein the switch control section is configured to performswitching control by selecting any one of a power-reception operationand a data-transmission operation based on a magnitude of a signal levelof the received signal of each of a frequency component for the powertransmission and a frequency component for the data transmission in thesignal.
 17. The electronic apparatus of claim 16, wherein the switchcontrol section performs the switching control with use of comparisonresults between a predetermined carrier threshold and the signal levelof each of the frequency component for the power transmission and thefrequency component for the data transmission.
 18. The electronicapparatus of claim 17, wherein the switch control section controls afirst changeover switch to be in the ON state when the signal level ofthe frequency component for the power transmission is equal to or largerthan a first carrier threshold, and controls the first changeover switchto be in the OFF state when the signal level of the frequency componentfor the power transmission is smaller than the first carrier threshold.19. A method of routing a received wireless signal based on a frequencycomprising: receiving a signal wirelessly from a feed unit via magneticinductance; applying a first filter to the received signal to generate afirst frequency component; applying a second filter to the receivedsignal to generate a second frequency component; routing the receivedsignal to a power-reception operation section if a magnitude of thefirst frequency component exceeds a first voltage threshold; and routingthe received signal to a data-transmission operation section if amagnitude of the second frequency component exceeds a second voltagethreshold.
 20. The method of claim 19, further comprising: determiningwhether the received signal is greater than a third voltage thresholdprior to routing the received signal; and performing error processing onthe received signal if the received signal is greater than the thirdvoltage threshold.
 21. The method of claim 20, wherein error processingincludes routing the received signal to a ground potential instead ofrouting the received signal to the data-transmission operation sectionor the power-reception operation section.
 22. The method of claim 19,wherein the received signal and subsequent received signals are routedto the power-reception operation section so long as a magnitude of thefirst frequency component of the subsequent received signals exceeds thefirst voltage threshold.
 23. The method of claim 19, wherein thereceived signal and subsequent received signals are routed to thedata-transmission operation section so long as a magnitude of the secondfrequency component of the subsequent received signals exceeds thesecond voltage threshold and a magnitude of the first frequencycomponent of the subsequent received signals is less than the firstvoltage threshold.
 24. An electronic system comprising: a transmitterconfigured to wirelessly transmit a power signal and a data signal; anelectronic device wirelessly communicatively coupled to the transmitter,the electronic device including: a switch control section to: determinewhether a signal received from the transmitter is the power signal orthe data signal based on a frequency component of the received signal;and select any one of a power-reception operation and adata-transmission operation based on the determination of the receivedsignal.
 25. The electronic system of claim 24, wherein the electronicdevice includes an induction coil that is electromagnetically coupled toa second induction coil included within the transmitter.
 26. Theelectronic system of claim 24, wherein the transmitter is a chargingtray.
 27. The electronic system of claim 24, wherein the transmitterincludes a detection circuit configured to detect a second data signalfrom the electronic device.
 28. The electronic system of claim 27,wherein the transmitter suspends transmitting the power signal when thedetection circuit detects the second data signal.